JP2778325B2 - Secondary search radar equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an SLS of an electronic scanning secondary search radar antenna using a Butler matrix circuit.
About the aerial.

[0002]

2. Description of the Related Art In a conventional example, an SLS antenna and a column array antenna for sum / difference beam radiation are provided independently.
Next, a conventional example will be described with reference to the drawings. FIG. 3 is a system diagram of a conventional example, and FIG. 4 is a diagram showing a beam pattern of a conventional example. The conventional example includes column array antennas 13a to 13x for sum beam and difference beam radiation, a high-frequency switch 1
4a to 14h, Butler matrix circuit 15, power divider 16 for simultaneous sum / difference beam combining, and SLS antenna 19
Is provided. When an electronic scanning antenna is realized using the Butler matrix circuit 15, the column array antenna 13 is used.
The circumference of a to 13x is divided into integers, and power is supplied to the column array antenna in one range, and power is not supplied to the other elements. FIG. 3 shows an example in which the circumference is divided into three parts. 120 each other
Since the column array antennas separated from each other are not supplied with power at the same time, the output of the Butler matrix circuit 15 is set to SP3.
Switching is performed by T-type high-frequency switches 14a to 14h. Each of the sum beam signal / difference beam signal and the SLS beam signal of the secondary search radar transmitting / receiving apparatus is connected to a sum beam input / output terminal 17, a difference beam output terminal 18, and an SLS beam input / output terminal 20, respectively.

FIG. 6 is a circuit diagram of a power divider 16 for simultaneous sum / difference beam combining. The power divider 16 for simultaneous sum / difference beam combining is a circuit for giving an appropriate aperture distribution to each element of the column array antenna. The sum beam signal and the difference beam signal connected to the sum beam input / output terminal 25 and the difference beam output terminal 26 are connected to power distributor input / output terminals 31a to 31h. Here, the power distributor input / output terminals 31a to 31
The input and output values of h are Aa to Ah for the sum beam signal and Ba to Bh for the difference beam signal, respectively. The sum beam signal of the sum beam input / output terminal 25 is divided into two equal phases by the rat race circuit 27, and the tandem feed circuits 30a and 30
0b. Tandem feed circuit 3
Reference numerals 0a and 30b denote power supply circuits having two systems of power distribution circuits, each of which outputs the sum of the outputs of the power distribution circuits. The sum beam signal connected to the tandem feed circuits 30a and 30b is distributed to Aa to Ah by one system of power distribution circuit of the tandem feed circuits 30a and 30b, and the power distributor input / output terminals 31a to 31h, respectively.
Is input / output. The difference beam signal from the difference beam output terminal 26 is supplied to the difference beam distribution circuit 29 by {(Aa to Ah):}.
((Ba-Aa) to (Bh-Ah)), one of which is equally distributed in the opposite phase by the rat race circuit 27 and connected to the power distribution circuit of the system to which the sum beam signals of the tandem feed circuits 30a and 30b are connected. The other is connected to a power distribution circuit of another system of the tandem feed circuits 30a and 30b. The difference beam signal is distributed and combined to An + (Bn-An) = Bn by the tandem feed circuits 30a and 30b, and connected to the power distributor input / output terminals 31a to 31h. The high-frequency signals distributed to the third of the array number of the column array antennas 13a to 13x by the power divider 16 for simultaneous sum / difference beam combining are rearranged by the Butler matrix circuit 15, and the high-frequency switches 14a to 14h.
And a sum beam pattern 22 and a difference beam pattern 23 are formed from one third of the column array antennas 13a to 13x. The SLS signal is connected to the SLS beam input / output terminal 20, and the column array antenna 13a
To 13x and the SLS antenna 19 provided independently.
An S beam pattern 24 is formed. In the case of reception, a high-frequency signal is output to the secondary search radar transmitting / receiving device via the reverse path. The scanning in the beam radiation direction is performed by the Butler matrix circuit 15 and the high-frequency switches 14a to 14h.
This is performed by switching the column array antenna that emits a signal.

[0004]

SUMMARY OF THE INVENTION Such a conventional example is as follows.
Since the column array antenna and the SLS antenna are independent, the effect of the roving due to ground reflection is not the same for the sum / difference beam and the SLS beam, and the target is lost by differential roving.

An object of the present invention is to provide a secondary search radar apparatus which eliminates such disadvantages and has means for preventing a target from being lost due to differential lobing of a sum beam and an SLS beam. .

[0006]

SUMMARY OF THE INVENTION The present invention provides a column array antenna having a plurality of antennas forming a sum beam and a difference beam, a Butler matrix circuit for rearranging high-frequency signals radiated by the column array antenna, and In a secondary search radar apparatus provided with a high frequency switching device for switching an antenna constituting a column array antenna, a high frequency signal is combined with a sum beam signal, a difference beam signal and an SLS beam signal at the same time and distributed to the Butler matrix circuit. A power divider for simultaneous difference / SLS beam combining, and an SLS beam signal are divided into two, one of which is provided to the Butler matrix circuit, and the other is the sum / difference / SLS.
And an SLS power divider provided to the beam simultaneous combining power divider.

Here, the power divider for simultaneous sum / difference / SLS beam synthesizing has means for synthesizing the SLS beam to radiate in the same direction and the opposite direction to the direction of the sum beam, respectively. Is desirable.

[0008]

The radiation direction 9 of the sum beam pattern 10 is the front direction of the column array antenna 1d, and the sum beam pattern 1
When 0 is radiated from the column array antennas 1a to 1g, the SLS signal is split into two by the SLS power splitter,
For the purpose of suppressing the side lobe of the sum beam pattern 10, the power is distributed by the power divider for simultaneous sum / difference / SLS beam synthesis and radiated from the column array antennas 1a to 1g, and the back lobe of the sum beam pattern 10 is suppressed. For the purpose, SLS signal is radiated from one column array antenna 1p to S
An LS pattern is formed. The Butler matrix circuit and the high frequency switch are used to scan the radiation direction.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is diagram of this embodiment, a pattern of <br/> embodiment of FIG 2 Yoko.

In this embodiment, as shown in FIG. 1, a column array antenna 1a to 1x having a plurality of antennas forming a sum beam and a difference beam, and a high-frequency signal radiated by the column array antennas 1a to 1x. Butler matrix circuit 3 for rearranging, and high-frequency switches 2a-2 for switching antennas 1a-1x forming a column array antenna
h, and as means characterized by the present invention,
High frequency signal is sum beam signal, difference beam signal and SLS
A sum / difference / SLS beam simultaneous synthesizing power splitter 4 for simultaneously synthesizing the beam signals and distributing them to the Butler matrix circuit 3; and distributing the SLS beam signals into two; Is sum / difference / SL
An SLS power splitter 5 provided to the S-beam simultaneous synthesizing power splitter 4; It has a means for synthesizing radiation in each of the directions.

Next, the operation of this embodiment will be described. When an electronic scanning antenna is realized by using the Butler matrix circuit 3, the column array antennas 1a to 1a around the antenna are used.
1x is divided into integers, and radiation is performed from a part thereof. The case where the column array antennas 1a to 1x are divided into three and a sum beam is radiated in the front direction 1d will be described. In this embodiment, in order to radiate the SLS signal in the opposite direction to the sum / difference signal, in order to use another column array antenna 1p, the number of elements 24 of the column array antennas 1a to 1x is divided into three by "8". The sum / difference signal is radiated from the column array antennas 1a to 1g of "7" obtained by subtracting "1".

The sum beam signal, difference beam signal and SLS beam signal of the secondary search radar transmitting / receiving apparatus are respectively sum beam input / output terminal 6, difference beam output terminal 7 and SL
Connected to S beam input / output terminal 8. The sum signal and the difference signal are input directly from the sum beam input / output terminal 6 and the difference beam output terminal 7 to the sum / difference / SLS beam simultaneous synthesizing power splitter 4. In order to radiate in the same direction and the opposite direction, they are distributed by the SLS power distributor 5, and one of them is input to the sum / difference / SLS beam simultaneous power distributor 4. The sum beam signal, the difference beam signal, and the SLS beam signal are added to the column array antennas 1a to 1 by the power divider 4 for simultaneous sum / difference / SLS beam synthesis.
The high-frequency signals distributed to the 7 arrays of h are input to the Butler matrix circuit 3. FIG. 5 is a circuit diagram of the power divider 4 for simultaneous sum / difference / SLS beam combining. Sum / Difference / S
The LS beam simultaneous combining power divider 4 is a circuit for giving an appropriate aperture distribution to each element of the column array antenna. Sum beam input / output terminal 32, difference beam output terminal 33 and SL
Each input / output signal of the S beam input / output terminal 34 is connected to the power distributor input / output terminals 40a to 40g. Here, the input / output values of the power divider input / output terminals 40a to 40g are respectively Aa to Ag for the sum beam signal, Ba to Bg for the difference beam signal, and Ca to Cg for the SLS beam signal. The sum beam signal of the sum beam input / output terminal 32 is a ratio Ad: 中心 (Aa to A) radiated from the center element of the column array antenna.
c, Ae to Ag) are distributed by the sum beam / SLS beam distribution circuit 37, and one is connected to the power distributor input / output terminal 40d. The remaining sum beam signal is the rat race circuit 3
5 is divided into two equal phases, and a tandem feed circuit 39a
And 39b. The tandem feed circuits 39a and 39b are power supply circuits that have two power distribution circuits and output the sum of the outputs of the power distribution circuits. The sum beam signal connected to the tandem feed circuits 39a and 39b is
The sum beam signals connected to a and 39b are distributed to Aa-Ac and Ae-Ag by one system of power distribution circuits in tandem feed circuits 39a and 39b, and are respectively connected to power input / output terminals 40a-40c and power distribution Input / output is performed at the device input / output terminals 40e to 40g. The difference beam signal at the difference beam output terminal 33 is output by the difference beam distribution circuit
(Aa-Ac, Ae-Ag): Σ (Ba-Aa)-(B
c-Ac) and (Be-Ae) to (Bg-Ag)), one of which is equally distributed to the opposite phase by the rat race circuit 35, and which is connected to the sum beam signal of the tandem feed circuits 39a and 39b. The other is connected to the power distribution circuit, and the other is connected to another power distribution circuit of the tandem feed circuits 39a and 39b. The difference beam signal is supplied to the tandem feed circuits 39a and 39b by An + (Bn-A
n) = Bn.
a to 40c and power distributor input / output terminals 40e to 40g
Connected to. The SLS beam signal of the SLS beam input / output terminal 34 is output by a sum beam / SLS beam distribution circuit 37.
(Aa-Ac, Ae-Ag): Ad = Cd: Σ (Ca-
Cc, Ce to Cg), one of which is directly connected to the power distributor input / output terminal 40d, and the other is connected to the power distributor input / output terminals 40a to 40c and the power distributor input / output terminal 40e via the feed system of the sum beam. Ca to Cc, Ce to ~ 40g
To Cg. The Butler matrix circuit 3 rearranges eight signals obtained by adding the seven outputs of the sum / difference / SLS beam simultaneous power divider 4 and the other output of the SLS power divider 5 to the high frequency switches 2a to 2h. Output. The scanning in the beam radiation direction is performed by switching the column array antenna with the Butler matrix circuit 3 and the high frequency switches 2a to 2h. In the case of this embodiment, in order to radiate a sum beam in the 1d front direction, seven outputs of the sum / difference / SLS beam simultaneous synthesizing power splitter 4 are output to the high frequency switches 2a to 2g, and the SLS power is output. The other output of the distributor 5 is output to the high frequency switch 2h. The high-frequency switches 2a to 2h switch high-frequency input signals to the elements of the column array antennas 1a to 1x that emit high-frequency signals. High frequency switching devices 2a-2
g is switched to the column array antennas 1a to 1g, respectively, and the high-frequency switch 2h is switched to the column array antenna 1p.
Is switched to. The column array antennas 1a to 1g form a sum beam pattern 10 and a difference beam pattern 11, and the column array antennas 1a to 1g and the column array antenna p form an SLS beam pattern 12.

Although the SLS beam pattern 12 of the present invention has a figure eight shape, the radiation in the lateral direction of the sum beam pattern 10 is sufficiently small, so that the SLS beam pattern 12 is formed forward and rearward to form the sum beam pattern. It is possible to suppress ten side lobes and back lobes.

[0014]

According to the present invention, as described above, the SLS
Since the beam is radiated and received using the same column array antenna as the sum beam, the effect of the roving due to ground reflection is the same as that of the sum beam and the SLS beam, and there is an effect of preventing the target from being lost by the differential roving. In addition, by replacing the power splitter for simultaneous formation of sum and difference beams of the conventional electronic scanning type secondary search radar antenna and adding a power splitter for SLS, a Butler matrix circuit, a high-frequency switch, and a column array antenna are provided. Since the same can be used, there is an effect that the present invention can be easily and inexpensively implemented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a beam pattern according to an embodiment of the present invention.

FIG. 3 is a block diagram showing the configuration of a conventional example.

FIG. 4 is a diagram showing a beam pattern of a conventional example.

FIG. 5 is a circuit diagram showing a configuration of a power divider for simultaneous formation of a sum, a difference, and an SLS beam included in FIG. 1;

FIG. 6 is a circuit diagram showing a configuration of a power divider for simultaneous formation of sum and difference beams included in FIG. 3;

[Description of Signs] 1a to 1x Column Array Antenna 2a to 2h High Frequency Switcher 3 Butler Matrix Circuit 4 Sum, Difference, SLS Beam Simultaneous Synthesis Power Divider 5 SLS Power Divider 6 Sum Beam I / O Terminal 7 Difference Beam Output Terminal 8 SLS beam input / output terminal 9 Sum beam radiation direction 10 Sum beam pattern 11 Difference beam pattern 12 SLS beam pattern 13a to 13x Column array antenna 14a to 14h High frequency switcher 15 Butler matrix circuit 16 Power distribution for simultaneous sum and difference beam synthesis Device 17 Sum beam input / output terminal 18 Difference beam output terminal 19 SLS antenna 20 SLS beam input / output terminal 21 Sum beam radiation direction 22 Sum beam pattern 23 Difference beam pattern 24 SLS beam pattern 25 Sum beam input / output terminal 26 Difference beam output terminal 27 Rat race circuit 28 Rat race circuit 29 Difference beam distribution circuit 30a, 30b Tandem feed circuit 31a-31h Power distributor input / output terminal 32 Sum beam input / output terminal 33 Difference beam output terminal 34 SLS beam input / output terminal 35 Rat race circuit 36 Rat race circuit 37 Sum beam / SLS beam distribution circuit 38 Difference beam distribution circuit 39a, 39b Tandem feed circuit 40a-40g Power distributor input / output terminal

Claims (1)

(57) [Claims] 1. A column array antenna having a plurality of antennas forming a sum beam and a difference beam, a Butler matrix circuit for rearranging high-frequency signals radiated by the column array antenna, and an antenna forming the column array antenna. A secondary search radar apparatus having a high-frequency switching device for switching a high-frequency signal to a sum beam signal, a difference beam signal, and an SLS.
A power divider for simultaneous sum / difference / SLS beam synthesis for simultaneously synthesizing beam signals and distributing them to the Butler matrix circuit; distributing the SLS beam signals into two parts, providing one to the Butler matrix circuit and the other An SLS power divider provided to the sum / difference / SLS beam simultaneous synthesizing power splitter.
The direction of the SLS beam is the same as the direction of the sum beam.
Means for performing synthesis so as to radiate the SLS beam signal to one of the SLS beam signals.
Signal in the opposite direction to the direction of the sum beam
Secondary search radar apparatus having means for rearranging high-frequency signals as described above .